Single stranded chains of biological DNA show a widespread occurrence of parity for complementary nucleotides, i.e., A=T, G=C. This has been referred to as A-T, G-C symmetry. A distinction must be made between this, which this paper calls mirror symmetry, and twofold symmetry, where complementary nucleotide parity occurs between two segments, of the same length and equidistant from a symmetry center, along a single-stranded DNA chain. I have analysed the sequence of Chromosome I of Saccharomyces cerevisiae for the occurrence of complementary nucleotide symmetry. Open reading frame (ORF) sequences made up 63% of the total chromosome length and most of them were asymmetric for both A-T and G-C. The sign of A-T asymmetry was correlated with transcriptional orientation (A>T for sense and A
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| Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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| Site | Modification | Modifier | Source | Reference |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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| Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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| Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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